摘要
探地雷达在地质勘探、军事、考古及建筑工程等领域有着非常重要的作用.为提高地下目标探测的准确性与成像分辨率,增强对地下线型目标的探测能力,提出了一种用于中浅层地下目标探测的高增益圆极化双槽Vivaldi天线.该Vivaldi天线的开槽部分由不同的指数线构成,使得槽的开口方向有一定的内倾,可以有效提高天线的增益;将两个双槽Vivaldi天线以正交的形式组合,并对天线两端口进行等幅、90°相位差的馈电,实现天线的圆极化辐射.仿真与实测结果表明,所设计的高增益双槽Vivaldi天线在0.5~3GHz内驻波比小于2,绝对带宽为2.5 GHz;带内增益均大于3.5 dBi,最大增益可达12.5 dBi;工作频带内轴比均小于3 dB且具有较好的时域特性.所提出的天线具有超宽带、高增益、圆极化等特点,在地下目标探测中具有广阔的应用前景.
Ground penetrating radar plays a very important role in geological exploration,military,archaeology,construction engineering and other fields.To improve the accuracy and imaging resolution of underground target detection systems and enhance the detection ability of underground linear targets,a high gain circular-polarized double-slot Vivaldi antenna is proposed for medium and shallow underground target detection.The slot part of the Vivaldi antenna is composed of different exponential lines,which makes the slot opening direction incline inward to a certain extent,and can effectively improve the gain of the antenna.Two double-slot Vivaldi antennas are combined in an orthogonal form,and are fed with equal amplitude and 90°phase difference to realize the circular polarization radiation.The simulation and measurement results show that the voltage standing wave ratio(VSWR)of the proposed antenna is less than 2 in the range of 0.5-3 GHz.In this band,the antenna gain is greater than 3.5 dBi and the maximum gain can reach 12.5 dBi.The axial ratio in the working frequency band is less than 3 dB and the antenna has good time domain characteristics.The proposed antenna has the characteristics of ultra-wideband,high gain and circular polarization,which make the proposed antenna have broad applications in underground target detection.
作者
刘淑芳
薛源
李坤哲
毛玥
程乾
史小卫
LIU Shufang;XUE Yuan;LI Kunzhe;MAO Yue;CHENG Qian;SHI Xiaowei(School of Electronic Engineering,Xidian University,Xi’an 710071,China)
出处
《电波科学学报》
CSCD
北大核心
2023年第3期470-475,共6页
Chinese Journal of Radio Science
关键词
探地雷达天线
双槽Vivaldi天线
高增益
超宽带
圆极化
ground penetrating radar antenna
double-slot Vivaldi antenna
high gain
ultra-wideband
circular polarization
